Damage accumulation behavior of non-crimp fabric-reinforced epoxy composite under static and cyclic tensile loading
Damage accumulation behavior of non-crimp fabric-reinforced epoxy composite under static and cyclic tensile loading
复制标题
无卷曲织物增强环氧复合材料在静态和循环拉伸载荷下的损伤累积行为
DOI：
10.1080/09243046.2013.809636
复制
发表时间：
2013
影响因子：
2.9
通讯作者：
C. R. Ríos
中科院分区：
文献类型：
--
作者：
T. Sakai;S. Wakayama;E. Pérez;J. Rodriguez;C. R. Ríos
分析了嵌入环氧树脂基体中的具有[0°，+45°，90 °，−45°]堆叠顺序的无卷曲织物。为了研究损伤的产生和扩展与织物几何形状之间的关系，在0°、45°和90°的纺织结构方向上，从不同取向的层合板中获得了用于力学测试的样品。进行拉伸模式试验（静态和循环），以评估损坏的演变，使用声发射技术作为主要工具，该技术允许在“真实的时间”试验期间监测材料的机械行为。结果表明，有一个显着的机械影响的增强纺织品的复合材料和损伤的产生和进展（断裂机制）是高度依赖的方向，其中施加的应力与结构的织物。在静态拉伸模式下，0°取向的样品表现出比90°取向的样品更好的力学参数，而45°取向的样品表现出更小的力学参数。织物几何形状的效果被证明在这种机制中有影响。在循环拉伸模式下，在低应力下观察到Kaiser效应，而实验结果表明，随着应力水平的增加，Felicity效应沿着变得更加明显。
A non-crimp fabric with a stacking sequence of [0°,+45°,90°,−45°] embedded in epoxy resin matrix was analyzed. Samples for mechanical test were obtained from laminates at different orientations depending on the textile architecture direction at 0°, 45°, and 90° in order to study the relationship between damage initiation and propagation with fabric geometry. Tension mode tests (static and cyclic) were carried out to evaluate the evolution of damage using as a main tool, the acoustic emission technique that allows monitoring the mechanical behavior of the materials during the test in ‘real time’. Results show that there is a remarkable mechanical influence of the reinforcement textile in the composite and that damage generation and progression (mechanisms of fracture) is highly dependent of the direction in which the stress is applied in relation with the architecture of the fabric. In static tensile mode, samples at 0° exhibited better mechanical parameters than samples at 90°, while at 45° orientation was lesser. The effect of textile geometry was demonstrated to have an influence in such mechanisms. In cyclic tensile mode, Kaiser effect is observed at low stresses, while the experimental results showed that the Felicity effect became clearer along with the increasing of stress level.